I’m pretty sure this section could use some refinement and include perhaps latency at least. I generally play with latency around 300ms. This turns a 1.5s Flash Heal into a 1.8s Flash Heal. A very quick and dirty sensitivity test shows that dropping a 1.8s cast time into the equation results in a Haste Rating MP5 value of 0.243666 for Discipline and 0.254898 for Holy. The reason for this is not that the percentage of additional casts changes (it doesn’t), but that the same healing payload, and therefore equivalent MP5 value, is delivered over a longer timeframe. You get less bang for your buck. Or rather the same bang but for more bucks.

Incidentally the values for spamming Greater heal with 300ms latency are 0.321005 for Discipline and 0.335357 for Holy.

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This entry was posted on Tuesday, April 28th, 2009 at 8:00 am and is filed under Blogging. You can follow any responses to this entry through the RSS 2.0 feed.
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Your computation is overly complicated (and results in small rounding errors). The value of haste rating is simply the change in healing per second (weighted by the SP MP5 value). Below is a simpler calculation (for holy). It is completely equivalent to yours:

Here is a more troubling issue: increasing haste also increases mana usage. Spamming Flash Heal with 1% haste uses an additional 4.63 mana per second (695/1.5 vs 695/1.485), or 23.2 MP5. Thus, 1 haste rating also results in 23.2/32.8 or -0.706 MP5. Combining the benefit of increased heals and the cost of additional mana results in a negative weight for haste, meaning that increasing haste is a bad idea. The good (?) news is that these values are all inaccurate because they don’t account for crit, procs, talents, and glyphs that increase healing and lower mana cost. I expect the actual value of 1 haste rating to be more than 0, but much less than 0.309.

@jambolo – thanks for the comments. I realised later that I had gone the long way around to calculate the haste value.

Your calculation is far simplier than my mess and I might update the post with it at some stage.

Your second comment is interesting. From a purely mana regen focused point of view you are right, haste is bad. Haste is never going to be a net benefit to your mana regen. The trick is to get a balance between that and throughput.

Personally i’m not a huge fan of haste as a healer and I think it is more of a personal preference stat than the others.